What is the real difference between the two. And no, I don't mean one is hotter or have higher temperature than the other.
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the molecules in the hotter one is moving faster.
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If the contents of the two glasses are both pure water, then you have already identified the difference. At the macro level, there is no other difference between the two.
It's kind of like asking what's the difference between a circle and a square and I don't mean that one has four sides and four corners and one has one side and no corners.
It's kind of like asking what's the difference between a circle and a square and I don't mean that one has four sides and four corners and one has one side and no corners.